Those are awesome reels, love them myself. You say you removed 2 of the 4 mag., you did put them back, right?
Another thing to check, make sure you didn't overfill the spool. as far as the 8 lb. on a C series, I wouldn't. The space between the spool and the frame is a bit too much. You can find a schematic with google if you think you assembled wrong. Get things straightened out, and you'll love those reels. Good luck!